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The purchased manual is an scan of the original Panasonic paper-based Service Manual. Unfortunately the contrast is not perfect, but I am satisfied anyway!
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The purchased manual is an high-quality scan of the original JVC paper-based Service Manual. The Service Manual includes the Owner´s Manual, so you do not have to buy both of them.
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It paid to find this Service Manual, couldn't find it anywhere else. Exactly what I wanted. Received within 24 hours.
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Complete manual with clear schematic diagrams and printed circuit board layouts of two variants of the headset and the transmitter an old and a new version.
Also shows how the headset and the transmitter is opened and how transmitter and receivers can be adjusted and where to measure.
I had no problems to repair the headset using this service manual.
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Excellent printing quality. A complete and very useful manual with all details.
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7.1.7 TROUBLE SHOOTING
No.
1
Symptoms
The power is not turned on.
Diagnosis Contents
Check the voltage of EV+4V, �28V and FLDC on the POWER SUPPLY Unit. Are wires of output connector (POWER SUPPLY Unit) and CN401 (DVDM Assy) disconnected or damaged ? Check that the following voltage is output : IC403-pin 5 : 3.3V on the DVDM Assy Check that the voltage at IC101-pin 22 (KEY0) on the FLKY Assy becomes 0 V when the POWER key is pressed and 3.3 V when it is released.
Possible Defective Points
POWER SUPPLY Unit
A
Connector / cable 3.3V Regulator IC (IC403) FLKY Assy Tact SW (when operation of only the POWER key on the main unit is not accepted)
FLKY Assy Check that the voltage at IC101-pin 17 (SEL IR) on the FLKY Assy is in Remote receiver section the range between 0 and 3.3 V while receiving signals from the remote (when operation of only the control unit when any key on it is pressed. POWER key on the remote control unit is not accepted) 2 An opening screen is not Is the level at both IC101-pin 12 (XRESET) and pin 11 (POWER ON) FLKY Assy displayed on the monitor on the FLKY Assy "H" ? FL Control IC (IC101) (The FL display lights. The � Check the voltage of E+6.8V and SW+3.3V on the POWER SUPPLY mechanism does not work.) Unit. POWER SUPPLY Unit � Check the voltage of P-CONT is about 3V on the POWER SUPPLY Unit. DVDM Assy Check that the following voltage are output : 5V Regulator IC (IC401) IC401-pin 5 : 5V, IC402-pin 5 : 2.5V on the DVDM Assy. 2.5V Regulator IC (IC402) DVDM Assy Is a resonator (X601 : 27MHz) on the DVDM Assy oscillating ? � Is a signal input into IC603-pin26 (PCE#) on the DVDM Assy ? (Is a signal "H" for 80 mS and then "L" after the power is turned on ?) � Communication with flash ROM. � Are the signals input into IC602-pin 16 (DWE#), pin 19 (DCS#) and pin 38 (SDCLK) on the DVDM Assy ? (Is a signal fluctuating ?) � Communication with SDRAM Crystal resonator (X601)
B
C
DVDM Assy DVD IC (IC601) Flash ROM (IC603) SDRAM (IC602)
Is a signal output from IC603-pin 28 (PRD#) on the DVDM Assy? DVDM Assy (Is a signal fluctuating for several hundred mS after the power is turned Flash ROM (IC603) on ?) DVDM Assy Is a signal input into IC101-pin 16 (ACK) on the FLKY Assy ? DVD IC (IC601) (Is a signal fluctuating ?) FLKY Assy � Communication with FL Control IC FL Control IC (IC101) Is a signal output from IC101-pin 10 (XREADY) on the FLKY Assy ? FLKY Assy (Is a signal fluctuating in the range of 0-3V ?) FL Control IC (IC101) DVDM Assy Are the signals output from IC101-pin 9, pin 8 and pin 7 on the FLKY DVD IC (IC601) � Assy ? FLKY Assy (in the range of 0-3V) FL Control IC (IC101) communication line Are the signals of IC60-pin 5(SDA) and pin 6(SCL) on the DVDM Assy DVDM Assy fluctuating for one or two seconds after the power is turned ? EEPROM (IC60) 3 An opening screen is not DVDM Assy displayed on the monitor Check the video signal path between DVD IC (DVDM Assy IC601) and Video circuit after DVD IC (The FL display lights. The video-out terminal (see the block diagram) (IC601) mechanism does not work.)
D
E
F
DV-270-S
5 6 7 8
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